Workers Re-Enter Reactor Building for the First Time

By

Hiroyuki Kachi

Updated May 6, 2011 12:01 a.m. ET

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TOKYO—Ventilators were switched on Thursday inside the highly radiated No. 1 reactor building at the crippled Fukushima Daiichi complex after workers entered the building for the first time since it was heavily damaged by a hydrogen explosion the day after the March 11 disasters.